Where do Poles spend their summertime? Part 2: Plotting Instagram posts on map of Poland

Brief description: Part 2 of the Instagram vacation project (see part one here). The most popular vacation destinations in Poland, from where instagram photos with hashtag ‘wakacje’ ( eng. vacation) were taken during June and July of 2018.
More than 230 000 posts were downloaded from Instagram, and 180 000 of them had geolocation. Data was cleaned and transformed into geojson for the purpose of using Google Maps JavaScript API.